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Mykrox Tablets
Overview
What is Mykrox Tablets?
MYKROX Tablets (metolazone tablets, USP) for oral administration contain ½ mg of metolazone, USP, a diuretic/saluretic/antihypertensive drug of the quinazoline class.
Metolazone has the molecular formula CHClNOS, the chemical name 7-chloro-1, 2, 3, 4-tetrahydro-2-methyl-3-(2-methylphenyl)-4-oxo-6-quinazolinesulfonamide, and a molecular weight of 365.83. The structural formula is:
Metolazone is only sparingly soluble in water, but more soluble in plasma, blood, alkali, and organic solvents.
Inactive Ingredients: Dibasic calcium phosphate, magnesium stearate, microcrystalline cellulose, pregelatinized starch, sodium starch glycolate.
What does Mykrox Tablets look like?
What are the available doses of Mykrox Tablets?
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What should I talk to my health care provider before I take Mykrox Tablets?
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How should I use Mykrox Tablets?
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What interacts with Mykrox Tablets?
Anuria, hepatic coma or precoma, known allergy or hypersensitivity to metolazone.
What are the warnings of Mykrox Tablets?
Rapid Onset Hyponatremia and/or Hypokalemia
Rarely, the rapid onset of severe hyponatremia and/or hypokalemia has been reported following initial doses of thiazide and non-thiazide diuretics. When symptoms consistent with severe electrolyte imbalance appear rapidly, drug should be discontinued and supportive measures should be initiated immediately. Parenteral electrolytes may be required. Appropriateness of therapy with this class of drugs should be carefully reevaluated.
Hypokalemia
Hypokalemia may occur with consequent weakness, cramps, and cardiac dysrhythmias. Serum potassium should be determined at regular and appropriate intervals, and dose reduction, potassium supplementation or addition of a potassium-sparing diuretic instituted whenever indicated. Hypokalemia is a particular hazard in patients who are digitalized or who have or have had a ventricular arrhythmia; dangerous or fatal arrhythmias may be precipitated. Hypokalemia is dose related.
In controlled clinical trials, 1.5% of patients taking ½ mg and 3.1% of patients taking 1 mg of MYKROX daily developed clinical hypokalemia (defined as hypokalemia accompanied by signs or symptoms); 21% of the patients taking ½ mg and 30% of the patients taking 1 mg of MYKROX daily developed hypokalemia (defined as a serum potassium concentration below 3.5 mEq/L); in another controlled clinical trial in which the patients started therapy with a serum potassium level greater than 4.0 mEq/L, 8% of patients taking ½ mg of MYKROX daily developed hypokalemia (defined as a serum potassium concentration below 3.5 mEq/L).
Concomitant Therapy
Lithium
In general, diuretics should not be given concomitantly with lithium because they reduce its renal clearance and add a high risk of lithium toxicity. Read prescribing information for lithium preparations before use of such concomitant therapy.
Furosemide
Unusually large or prolonged losses of fluids and electrolytes may result when metolazone is administered concomitantly to patients receiving furosemide (see ).
Other Antihypertensive Drugs
When MYKROX Tablets are used with other antihypertensive drugs, particular care must be taken to avoid excessive reduction of blood pressure, especially during initial therapy.
Cross-Allergy
Cross-allergy may occur when MYKROX Tablets are given to patients known to be allergic to sulfonamide-derived drugs, thiazides, or quinethazone.
Sensitivity Reactions
Sensitivity reactions (e.g., angioedema, bronchospasm) may occur with or without a history of allergy or bronchial asthma and may occur with the first dose of MYKROX.
What are the precautions of Mykrox Tablets?
DO NOT INTERCHANGE
MYKROX TABLETS ARE A RAPIDLY AVAILABLE FORMULATION OF METOLAZONE FOR ORAL ADMINISTRATION. MYKROX TABLETS AND OTHER FORMULATIONS OF METOLAZONE THAT SHARE ITS MORE RAPID AND COMPLETE BIOAVAILABILITY ARE
NOT
THERAPEUTICALLY EQUIVALENT TO ZAROXOLYN TABLETS AND OTHER FORMULATIONS OF METOLAZONE THAT SHARE ITS SLOW AND INCOMPLETE BIOAVAILABILITY. FORMULATIONS BIOEQUIVALENT TO MYKROX AND FORMULATIONS BIOEQUIVALENT TO ZAROXOLYN SHOULD
NOT
BE INTERCHANGED FOR ONE ANOTHER.
General
Fluid and Electrolytes
All patients receiving therapy with MYKROX Tablets should have serum electrolyte measurements done at appropriate intervals and be observed for clinical signs of fluid and/or electrolyte imbalance: namely, hyponatremia, hypochloremic alkalosis, and hypokalemia. In patients with severe edema accompanying cardiac failure or renal disease, a low-salt syndrome may be produced, especially with hot weather and a low-salt diet. Serum and urine electrolyte determinations are particularly important when the patient has protracted vomiting, severe diarrhea, or is receiving parenteral fluids. Warning signs of imbalance are: dryness of mouth, thirst, weakness, lethargy, drowsiness, restlessness, muscle pains or cramps, muscle fatigue, hypotension, oliguria, tachycardia, and gastrointestinal disturbances such as nausea and vomiting. Hyponatremia may occur at any time during long term therapy and, on rare occasions, may be life threatening.
The risk of hypokalemia is increased when larger doses are used, when diuresis is rapid, when severe liver disease is present, when corticosteroids are given concomitantly, when oral intake is inadequate or when excess potassium is being lost extrarenally, such as with vomiting or diarrhea.
Thiazide-like diuretics have been shown to increase the urinary excretion of magnesium; this may result in hypomagnesemia.
Glucose Tolerance
Metolazone may raise blood glucose concentrations possibly causing hyperglycemia and glycosuria in patients with diabetes or latent diabetes.
Hyperuricemia
MYKROX regularly causes an increase in serum uric acid and can occasionally precipitate gouty attacks even in patients without a prior history of them.
Azotemia
Azotemia, presumably prerenal azotemia, may be precipitated during the administration of MYKROX Tablets. If azotemia and oliguria worsen during treatment of patients with severe renal disease, MYKROX Tablets should be discontinued.
Renal Impairment
Use caution when administering MYKROX Tablets to patients with severely impaired renal function. As most of the drug is excreted by the renal route, accumulation may occur.
Orthostatic Hypotension
Orthostatic hypotension may occur; this may be potentiated by alcohol, barbiturates, narcotics, or concurrent therapy with other antihypertensive drugs. In controlled clinical trials, 1.4% of patients treated with MYKROX Tablets (½ mg) had orthostatic hypotension; this effect was not reported in the placebo group.
Hypercalcemia
Hypercalcemia may infrequently occur with metolazone, especially in patients taking high doses of vitamin D or with high bone turnover states, and may signify hidden hyperparathyroidism. Metolazone should be discontinued before tests for parathyroid function are performed.
Systemic Lupus Erythematosus
Thiazide diuretics have exacerbated or activated systemic lupus erythematosus and this possibility should be considered with MYKROX Tablets.
Information for Patients
Patients should be informed of possible adverse effects, advised to take the medication as directed, and promptly report any possible adverse reactions to the treating physician.
Drug Interactions
Diuretics
Furosemide and probably other loop diuretics given concomitantly with metolazone can cause unusually large or prolonged losses of fluid and electrolytes (see ).
Other Antihypertensives
When MYKROX Tablets are used with other antihypertensive drugs, care must be taken, especially during initial therapy. Dosage adjustments of other antihypertensives may be necessary.
Alcohol, Barbiturates, and Narcotics
The hypotensive effects of these drugs may be potentiated by the volume contraction that may be associated with metolazone therapy.
Digitalis Glycosides
Diuretic-induced hypokalemia can increase the sensitivity of the myocardium to digitalis. Serious arrhythmias can result.
Corticosteroids or ACTH
May increase the risk of hypokalemia and increase salt and water retention.
Lithium
Serum lithium levels may increase (see ).
Curariform Drugs
Diuretic-induced hypokalemia may enhance neuromuscular blocking effects of curariform drugs (such as tubocurarine) – the most serious effect would be respiratory depression which could proceed to apnea. Accordingly, it may be advisable to discontinue MYKROX® Tablets (metolazone tablets, USP) three days before elective surgery.
Salicylates and Other Non-Steroidal Anti-Inflammatory Drugs
May decrease the antihypertensive effects of MYKROX Tablets.
Sympathomimetics
Metolazone may decrease arterial responsiveness to norepinephrine, but this diminution is not sufficient to preclude effectiveness of the pressor agent for therapeutic use.
Insulin and Oral Antidiabetic Agents
See under PRECAUTIONS, General.
Methenamine
Efficacy may be decreased due to urinary alkalizing effect of metolazone.
Anticoagulants
Metolazone, as well as other thiazide-like diuretics, may affect the hypoprothrombinemic response to anticoagulants; dosage adjustments may be necessary.
Drug/Laboratory Test Interactions
None reported.
Carcinogenesis, Mutagenesis, Impairment of Fertility
Mice and rats administered metolazone 5 days/week for up to 18 and 24 months, respectively, at daily doses of 2, 10, and 50 mg/kg, exhibited no evidence of a tumorigenic effect of the drug. The small number of animals examined histologically and poor survival in the mice limit the conclusions that can be reached from these studies.
Metolazone was not mutagenic in the Ames Test using Salmonella typhimurium strains TA-97, TA-98, TA-100, TA-102, and TA-1535.
Reproductive performance has been evaluated in mice and rats. There is no evidence that metolazone possesses the potential for altering reproductive capacity in mice. In a rat study, in which males were treated orally with metolazone at doses of 2, 10, and 50 mg/kg for 127 days prior to mating with untreated females, an increased number of resorption sites was observed in dams mated with males from the 50 mg/kg group. In addition, the birth weight of offspring was decreased and the pregnancy rate was reduced in dams mated with males from the 10 and 50 mg/kg groups.
Pregnancy
The use of MYKROX Tablets in pregnant women requires that the anticipated benefit be weighed against possible hazards to the fetus. These hazards include fetal or neonatal jaundice, thrombocytopenia, and possibly other adverse reactions which have occurred in the adult. It is not known what effect the use of the drug during pregnancy has on the later growth, development, and functional maturation of the child. No such effects have been reported with metolazone.
Labor and Delivery
Based on clinical studies in which women received metolazone in late pregnancy until the time of delivery, there is no evidence that the drug has any adverse effects on the normal course of labor or delivery.
Nursing Mothers
Metolazone appears in breast milk. Because of the potential for serious adverse reactions in nursing infants from metolazone, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
Pediatric Use
Safety and effectiveness of MYKROX Tablets in pediatric patients have not been established, and such use is not recommended.
Geriatric Use
Clinical studies of MYKROX did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.
This drug is known to be substantially excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.
What are the side effects of Mykrox Tablets?
Adverse experience information is available from more than 14 years of accumulated marketing experience with other formulations of metolazone for which reliable quantitative information is lacking and from controlled clinical trials with MYKROX from which incidences can be calculated.
In controlled clinical trials with MYKROX, adverse experiences resulted in discontinuation of therapy in 6.7-6.8% of patients given ½ to 1 mg of MYKROX.
Adverse experiences occurring in controlled clinical trials with MYKROX with an incidence of >2%, whether or not considered drug-related, are summarized in the following table.
Some of the adverse effects reported in association with MYKROX also occur frequently in untreated hypertensive patients, such as headache and dizziness, which occurred in 14.8 and 7.4% of patients in a smaller parallel placebo group.
The following adverse effects were reported in less than 2% of the MYKROX treated patients.
| * Percent of patients reporting an adverse experience one or more times. | ||
| † All doses combined (½, 1, and 2 mg). | ||
| MYKROX | n = 226† | |
| Dizziness (lightheadedness) | 10.2 | |
| Headaches | 9.3 | |
| Muscle Cramps | 5.8 | |
| Fatigue (malaise, lethargy, lassitude) | 4.4 | |
| Joint Pain, swelling | 3.1 | |
| Chest Pain (precordial discomfort) | 2.7 |
Cardiovascular
Cold extremities, edema, orthostatic hypotension, palpitations.
Central and Peripheral Nervous System
Anxiety, depression, dry mouth, impotence, nervousness, neuropathy, weakness, “weird” feeling.
Dermatological
Pruritus, rash, skin dryness.
Eyes, Ears, Nose, Throat
Cough, epistaxis, eye itching, sinus congestion, sore throat, tinnitus.
Gastrointestinal
Abdominal discomfort (pain, bloating), bitter taste, constipation, diarrhea, nausea, vomiting.
Genitourinary
Nocturia.
Musculoskeletal
Back pain.
Other Adverse Experiences
Adverse experiences reported with other marketed metolazone formulations and most thiazide diuretics, for which quantitative data are not available, are listed in decreasing order of severity within body systems. Several are single or rare occurrences.
Cardiovascular
excessive volume depletion, hemoconcentration, venous thrombosis.
Central and Peripheral Nervous System
syncope, paresthesias, drowsiness, restlessness (sometimes resulting in insomnia).
Dermatologic/Hypersensitivity
toxic epidermal necrolysis (TEN), Stevens-Johnson Syndrome, necrotizing angiitis (cutaneous vasculitis), skin necrosis, purpura, petechiae, dermatitis, photosensitivity, urticaria, pruritus, skin rashes.
Gastrointestinal
hepatitis, intrahepatic cholestatic jaundice, pancreatitis, anorexia, nausea, diarrhea, abdominal pain.
Hematologic
aplastic (hypoplastic) anemia, agranulocytosis, leukopenia, thrombocytopenia.
Metabolic
hypokalemia (see ), hyponatremia, hyperuricemia, hypochloremia, hypochloremic alkalosis, hyperglycemia, glycosuria, increase in serum urea nitrogen (BUN) or creatinine, hypophosphatemia, hypomagnesemia, hypercalcemia.
Musculoskeletal
acute gouty attacks.
Other
transient blurred vision, chills.
In addition, rare adverse experiences reported in association with similar antihypertensive-diuretics but not reported to date for metolazone include: sialadenitis, xanthopsia, respiratory distress (including pneumonitis), and anaphylactic reactions. These experiences could occur with clinical use of metolazone.
What should I look out for while using Mykrox Tablets?
Anuria, hepatic coma or precoma, known allergy or hypersensitivity to metolazone.
What might happen if I take too much Mykrox Tablets?
Intentional overdosage has been reported rarely with metolazone and similar diuretic drugs.
How should I store and handle Mykrox Tablets?
MYKROX Tablets (metolazone tablets, USP), ½ mg are white, flat-faced, round tablets, debossed “MYKROX” on one side, and “½” on reverse side.NDC 53014-847-71 Bottle of 100’s Store at 25°C (77°F); excursions permitted to 15°-30°C (59°-86°F) [See USP Controlled Room Temperature]. Protect from light. Keep out of the reach of children.MYKROX Tablets (metolazone tablets, USP), ½ mg are white, flat-faced, round tablets, debossed “MYKROX” on one side, and “½” on reverse side.NDC 53014-847-71 Bottle of 100’s Store at 25°C (77°F); excursions permitted to 15°-30°C (59°-86°F) [See USP Controlled Room Temperature]. Protect from light. Keep out of the reach of children.MYKROX Tablets (metolazone tablets, USP), ½ mg are white, flat-faced, round tablets, debossed “MYKROX” on one side, and “½” on reverse side.NDC 53014-847-71 Bottle of 100’s Store at 25°C (77°F); excursions permitted to 15°-30°C (59°-86°F) [See USP Controlled Room Temperature]. Protect from light. Keep out of the reach of children.
Clinical Information
Chemical Structure
No Image foundClinical Pharmacology
MYKROX (metolazone) is a quinazoline diuretic, with properties generally similar to the thiazide diuretics. The actions of MYKROX result from interference with the renal tubular mechanism of electrolyte reabsorption. MYKROX acts primarily to inhibit sodium reabsorption at the cortical diluting site and to a lesser extent in the proximal convoluted tubule. Sodium and chloride ions are excreted in approximately equivalent amounts. The increased delivery of sodium to the distal tubular exchange site results in increased potassium excretion. MYKROX does not inhibit carbonic anhydrase. A proximal action of metolazone has been shown in humans by increased excretion of phosphate and magnesium ions and by a markedly increased fractional excretion of sodium in patients with severely compromised glomerular filtration. This action has been demonstrated in animals by micropuncture studies.
The antihypertensive mechanism of action of metolazone is not fully understood but is presumed to be related to its saluretic and diuretic properties.
In two double-blind, controlled clinical trials of MYKROX Tablets, the maximum effect on mean blood pressure was achieved within 2 weeks of treatment and showed some evidence of an increased response at 1 mg compared to ½ mg. There was no indication of an increased response with 2 mg.
After six weeks of treatment, the mean fall in serum potassium was 0.42 mEq/L at ½ mg, 0.66 mEq/L at 1 mg, and 0.7 mEq/L at 2 mg. Serum uric acid increased by 1.1 to 1.4 mg/dL at increasing doses. There were small falls in serum sodium and chloride and a 1.3-2.1 mg/dL increase in BUN at increasing doses.
The rate and extent of absorption of metolazone from MYKROX Tablets were equivalent to those from an oral solution of metolazone. Peak blood levels are obtained within 2 to 4 hours of oral administration with an elimination half-life of approximately 14 hours. MYKROX Tablets have been shown to produce blood levels that are dose proportional between ½ -2 mg. Steady state blood levels are usually reached in 4-5 days.
In contrast, other formulations of metolazone produce peak blood concentrations approximately 8 hours following oral administration; absorption continues for an additional 12 hours.
Non-Clinical Toxicology
Anuria, hepatic coma or precoma, known allergy or hypersensitivity to metolazone.DO NOT INTERCHANGE
MYKROX TABLETS ARE A RAPIDLY AVAILABLE FORMULATION OF METOLAZONE FOR ORAL ADMINISTRATION. MYKROX TABLETS AND OTHER FORMULATIONS OF METOLAZONE THAT SHARE ITS MORE RAPID AND COMPLETE BIOAVAILABILITY ARE
NOT
THERAPEUTICALLY EQUIVALENT TO ZAROXOLYN TABLETS AND OTHER FORMULATIONS OF METOLAZONE THAT SHARE ITS SLOW AND INCOMPLETE BIOAVAILABILITY. FORMULATIONS BIOEQUIVALENT TO MYKROX AND FORMULATIONS BIOEQUIVALENT TO ZAROXOLYN SHOULD
NOT
BE INTERCHANGED FOR ONE ANOTHER.
Adverse experience information is available from more than 14 years of accumulated marketing experience with other formulations of metolazone for which reliable quantitative information is lacking and from controlled clinical trials with MYKROX from which incidences can be calculated.
In controlled clinical trials with MYKROX, adverse experiences resulted in discontinuation of therapy in 6.7-6.8% of patients given ½ to 1 mg of MYKROX.
Adverse experiences occurring in controlled clinical trials with MYKROX with an incidence of >2%, whether or not considered drug-related, are summarized in the following table.
Some of the adverse effects reported in association with MYKROX also occur frequently in untreated hypertensive patients, such as headache and dizziness, which occurred in 14.8 and 7.4% of patients in a smaller parallel placebo group.
The following adverse effects were reported in less than 2% of the MYKROX treated patients.
Reference
This information is obtained from the National Institute of Health's Standard Packaging Label drug database.
"https://dailymed.nlm.nih.gov/dailymed/"
While we update our database periodically, we cannot guarantee it is always updated to the latest version.
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